賓士原廠技術通報-W204/C300

- Harsh engagement when changing gear range from P to D -

Topic number	GI27.50-P-044018
Version	3
Design group	27.50 Gear assembly
Date	03-11-2010
Validity	Transmission 722.9 up to sequence number 1.842.410
Reason for change	Additional possible remedy

Complaint

When changing gear range from P to D, harsh engagement may be noticeable.

Cause

Friction coefficient fluctuations possible in the B2 disk packs in vehicles with transmission sequence numbers smaller than 1.842.410.

Remedy

Applies only for transmissions with sequence number less than 1.842.410: Replacement of B2 disks. Order parts as per EPC.

Otherwise the engagement sequences for N-D and N-R must be taught in again as follows:

Note: Always remain in the gear ranges N/R/D for at least 5 sec!

Start the engine from cold,

shift 5 times N-R,

shift 5 times N-D --> warm up transmission to 40°C and while doing so, exceed a speed of 50 km/h at least once.

shift 5 times N-R,

shift 5 times N-D --> warm up transmission to 70°C and while doing so, exceed a speed of 50 km/h at least once.

shift 5 times N-R,

shift 5 times N-D.

Symptoms

Symptom

Power transmission / Power transmission, function / Jolting/shuddering during start-off

Power transmission / Automatic transmission / Automatic transmission - function / General

Power transmission / Automatic transmission / Automatic transmission - function / Shuddering during start-off

Power transmission / Automatic transmission / Automatic transmission - function / Shudders

Power transmission / Automatic transmission / Automatic transmission - function / Poor shift quality